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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Oxidation (A) give para-benzoquinone (A) is:A. B. C. D. |
| Answer» Correct Answer - A,B,C | |
| 202. |
The correct acidic strength order of phenol is A. 1 gt 2 gt 4 gt 3B. 3 gt 1 gt 4 gt2C. 1 gt 2 gt 3 gt 4D. 3 gt1 gt 2 gt 4 |
| Answer» Correct Answer - B | |
| 203. |
Which of the following compounds on reaction with `CH_(3)Mg Br` will give a teritiary alcohol ?A. `C_(2)H_(5)CHO`B. `HCHO`C. `C_(2)H_(5)COOH`D. `C_(2)H_(5)COOCH_(3)` |
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Answer» Correct Answer - D |
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| 204. |
The correct order of acid strength of the following substituted phenol in water at `28^(@)C` is `:`A. p-nitrophenol `lt `p-fluorophenol `lt `p- - cholorophenolB. p-chlorophenol `lt` p- flurophenol `lt ` p-nitrophenolC. p-fluorophenol ` lt ` p-chlorophenol ` lt ` p-nitrophenolD. p-fluorophenol `lt ` p-nitrophenol `lt ` p-chlorophenol |
| Answer» Correct Answer - B | |
| 205. |
Decreasing order of acididy of substituted phenol is A. 3 gt 1 gt 4 gt 2B. 4 gt 3 gt 1 gt 2C. 4 gt 3 gt 2 gt 1D. 3 gt 1 gt 2 gt 4 |
| Answer» Correct Answer - A | |
| 206. |
An alcohol on oxidation is found to given `CH_(3)COOH` and `CH_(3)CH_(2)COOH`. The structure of the alcohol isA. `CH_(3)CH_(2)OH`B. `CH_(3)CH (OH) CH_(2)CH_(3)`C. `(CH_(3))_(2) C (OH) CH_(2)CH_(3)`D. `CH_(3)CH (OH) CH_(2)CH_(2) CH_(3)` |
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Answer» Correct Answer - D |
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| 207. |
Which is the correct decreassing order of acidic strength of substituted phenol ? A. 2 gt 1 gt 3 gt 4B. 3 gt 1 gt 2 gt 4C. 2 gt 1 gt 4 gt3D. 3 gt 2 gt 4 gt 1 |
| Answer» Correct Answer - C | |
| 208. |
n-prepyl alcohol and isopropyl alcohol can be chemically distinguished by which reagentA. `PCl_5`B. reductionC. oxidation with potassium dichromateD. `PCl_3` |
| Answer» Correct Answer - C | |
| 209. |
When primary alcohol is oxidised with `Cl_(2)`, it givesA. `CH_(3)CHO`B. `CH_(3)COCH_(3)`C. `CH_(3)COCl`D. `COCl_(2)` |
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Answer» Correct Answer - A A primary alochol on oxidation with `Cl_(2)` gives an aldehyde `(CH_(3)CHO).` `RCH_(2)OH overset(Cl_(2))underset("oxidation")rarr RCHO +2HCl` |
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| 210. |
The compound which gives the most stable carbonium ion on dehydration isA. `CH_(3)CH(CH_(3))CH_(2)OH`B. `(CH_(3))_(3)COH`C. `CH_(2)=CHCH_(2)CH_(2)OH`D. `CH_(3)CHOHCH_(2)-CH_(3)` |
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Answer» Correct Answer - B `underset("Tetriary alcohol")((CH_(3))_(3)C-OH) underset(-H_(2)O)overset(._(+)H^(+))(rarr) underset(underset(("more stable"))(3^(@) "carbocation"))((CH_(3))_(3)C^(+))` |
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| 211. |
t-butyl alcohol is heated with `Al_2O_3` givesA. `CH_3CH=CHCH_3`B. `CH_3CH_2CH=CH_2`C. `(CH_3)_2C=CH_2`D. all of these |
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Answer» Correct Answer - C `(CH_3)_3COH overset(Al_2O_3)to (CH_3)_2C=CH_2+H_2O` |
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| 212. |
Maximum number of active hydrogens are present inA. ethanoic acidB. ethyl alcoholC. ethylene glycolD. glycerol |
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Answer» Correct Answer - D Hydrogen attached to oxygen, nitrogen, sulphur, triply bonded-carbon etc. are called active hydrogen. Substance (a) and (b), contains 1 active hydrogen, (c) and (d) contains 2 and 3 active hydrogens respectively. |
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| 213. |
The compound which give the most stable carbonium ion on dehydration isA. `CH_(3) - underset(CH_(3))underset(|)(CH)- CH_(2)OH`B. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OH`C. `CH_(3)CH_(2)CH_(2)CH_(2)OH`D. `CH_(3)-underset(OH)underset(|)(CH)-CH_(2)CH_(3)` |
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Answer» Correct Answer - B |
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| 214. |
Which will give chiral molecule ?A. `CH_(3)COCl overset(LiAlH_(4))(rarr)`B. `C_(2)H_(5)CHOunderset(H^(+)//H_(2)O)overset(CH_(3)MgBr)(rarr)`C. `(CH_(3))_(2)CHC_(2)H_(5)overset(Cu)(rarr)`D. |
| Answer» Correct Answer - B | |
| 215. |
Which of the anion is most stable due to delocalisation ?A. B. C. D. |
| Answer» Correct Answer - D | |
| 216. |
Isopropyl alcohol is oxidised by `CrO_3` gives,A. `CH_3COCH_3`B. `CH_3COOH`C. `CH_3CH=CH_2`D. `CH_3CHO` |
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Answer» Correct Answer - A `(CH_3)_2CHOH + [O] overset"oxidation"to CH_3COCH_3 + H_2O` |
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| 217. |
The compound which gives the most stable carbonium ion on dehydration isA. `CH_3-CH(CH_3)-CH_2OH`B. `(CH_3)_3C-OH`C. `CH_3-CH_2-CH_2-CH_2OH`D. `CH_3CH(OH)CH_2CH_3` |
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Answer» Correct Answer - B Tertiary carbonium ion has maximum stability. The decreasing order of stability of carbonium ion is `3^@ gt 2^@ gt 1^@` |
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| 218. |
Ethyl alcohol is heated with `SOCl_2` gives,A. `C_2H_5Cl + HCl`B. `C_2H_5Cl + SO_2`C. `C_2H_5Cl + HCl + SO_2`D. `CH_3OH + CH_3Cl + SO_2` |
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Answer» Correct Answer - C `C_2H_5OH + SOCl_2 overset"pyridine"to C_2H_5Cl+ HCl + SO_2` |
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| 219. |
Which of the following will gives good yield of ether?A. B. C. D. |
| Answer» Correct Answer - B | |
| 220. |
Among the following the most stable compound isA. cis-1,2-cyclohexanedioB. trans-1,2-cyclohexanediolC. cis-1,3-cyclohexanediolD. trans-1,3-cyclohexanediol |
| Answer» Correct Answer - D | |
| 221. |
Diethyl ether finds its use in medicine asA. anaestheticB. antisepticC. hypnoticD. pain killer |
| Answer» Correct Answer - A | |
| 222. |
Diethyl ether can be decomposed by heating with `:`A. waterB. HIC. NaOHD. `KMnO_(4)` |
| Answer» Correct Answer - B | |
| 223. |
Ethyl alcohol is heated with conc. `H_(2)SO_(4)` . The product formed is:A. `H_(3)C-underset(O)underset(||)(C)-OC_(2)H_(5)`B. `C_(2)H_(6)`C. `C_(2)H_(4)`D. `C_(2)H_(2)` |
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Answer» Correct Answer - C `2C_(2)H_(5)OH overset(H_(2)SO_(4))underset(Delta) rarr C_(2)H_(4) +H_(2)O` |
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| 224. |
Which one of the following methods is uded to prepare `Me_(3)COEt` with a good yield ?A. Mixing EtONawith `Me_(3)C Cl`B. Mixing `Me_(3)CONa` with EtClC. Treatment of `Me_(3)COH` with EtMgID. Heating a mixture of `(1:1)` EtOH and `Me_(3)COH ` in presence of conc. `H_(2)SO_(4)` |
| Answer» Correct Answer - B | |
| 225. |
Which one of the following is incorrect about dimethyl ether ?A. It has boiling point lower than alcoholB. It is symmetrical etherC. Its boiling point is more than ethanolD. On treating with hot HI give single product |
| Answer» Correct Answer - C | |
| 226. |
Dimethyl ether can be decomposed by heating withA. `H_2O`B. NaOHC. `KMnO_4`D. HI |
| Answer» Correct Answer - D | |
| 227. |
When alcohol reacts with conc. `H_(2)SO_(4)`, intermediate compound formed is `:`A. carbonium ionsB. alkoxy ionC. alkyl hydrogen sulphateD. none of the above |
| Answer» Correct Answer - A | |
| 228. |
In the manufacture of ethanol from sugar, the enzymes used areA. diastase and zymaseB. maltase and zymaseC. diastase and invertaseD. invertase and zymase |
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Answer» Correct Answer - D `underset("Sugar")(C_(12)H_(22)O_(11))+H_(2)O overset("Invertase")rarr underset("Gulcose")(C_(6)H_(12)O_(6))+underset("Fructose")(C_(6)H_(12)O_(6))` `underset("or fructose")underset("Glucose")(C_(6)H_(12)O_(6))overset("Zymase")rarr underset("Ethanol")(2C_(2)H_(5)OH)+2CO_(2)` |
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| 229. |
Which of the following are benzylic alcohols ?A. `C_(6)H_(5)-CH_(2)-CH_(2)OH`B. `C_(6)H_(5)-CH_(2)OH`C. `C_(6)H_(5)-underset(CH_(3))underset(|)(CH)-OH`D. `C_(6)H_(5)-CH_(2)-underset(CH_(3))underset(|)(CH)-OH` |
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Answer» Correct Answer - B::C In benzylic alcohols, the -OH group is attached to a `sp^(3)` hybridised carbon atom next to an aromatic ring. In compound (a) and (d), the -OH group is attached to a `sp^(3)` hybridised carbon atom but this carbon is not attached to the benzene ring. On the other hand, in compound (a) and (c), the -OH group is attached to a `sp^(3)` hibridised carbon atom next to an aromatic ring. |
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| 230. |
`C_(4)H_(10)O` gives white precipitate immediately with conc. HCl in the presence of anhydrous `ZnCl_(2)`. Alcohol can be |
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Answer» Correct Answer - C `3^(@)` alcohol reacts most readily with conc. HCl forming white precipitate. `underset("alcohol")underset("Tertiary")(R_(3)COH)overset("Conc. HCl")underset("Anhy. "ZnCl_(2))rarrunderset("immediately")underset("Turbidity appears")(R_(3)"CCl")+H_(2)O` |
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| 231. |
Which of the following is pyridinium chlorochromate ?A. `C_6H_5NH^(+)CrO_3Cl`B. `C_5H_5NH^(+)CrO_3Cl`C. `C_6H_5SO_2Cl`D. `C_5H_5SO_2Cl` |
| Answer» Correct Answer - B | |
| 232. |
Aluminium metal reacts with alcohol givesA. ROAlB. `(RO)_2Al`C. `(RO)_3Al`D. RCOAl |
| Answer» Correct Answer - C | |
| 233. |
In Lucas test of alcohols, appearance of cloudiness is due to the formation ofA. aldehydesB. ketonesC. acid chloridesD. alkyl chlorides |
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Answer» Correct Answer - D `R-OH+HCl overset(ZnCl_(2)) rarr R-Cl +H_(2)O` (conc. `HCl +ZnCl_(2) rarr "Lucas reagent"`) `3^(@)" alcohol "+"Lucas reagent"rarr "Cloudiness appears immediately"` `2^(@)"alcohol"+"Lucas reagent" rarr"Cloudiness appears after 5 min."` `1^(@) "alcohol"+"Lucas reagent"rarr"Cloudiness appears after heating."` |
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| 234. |
Which of the following are benzylic alcohols I `C_(6)H_(5)-CH_(2)-CH_(2)OH` II `C_(6)H_(5)-CH_(2)OH` III. `C_(6)H_(5)-underset(""CH_(3))underset("| ")"CH"-OH` IV. `C_(6)H_(5)-CH_(2)-underset(CH_(3))underset("| ")"CH"-OH` select the correct option.A. Only IB. Both I and IIC. Both II and IIID. Both III and IV |
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Answer» Correct Answer - C Alcohols I and IV are not benzylic alcohols since, they do not carry the `-OH` group on that carbon which is directly linked to the benzene ring. |
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| 235. |
An isomer of ethanol is:A. methanolB. dimethyl etherC. acetoneD. diethyl ether |
| Answer» Correct Answer - B | |
| 236. |
The order for the acidic strength of `1^(@),2^(@),3^(@)` alcohols, `H_(2)O and RC -= CH` isA. `RC-=CH gt 3^(@) gt 2^(@) gt 1^(@) gt H_(2)O`B. `1^(@) gt 2^(@) gt 3^(@) gt H_(2)O gt RC-=CH`C. `H_(2)O gt 1^(@) gt 2^(@) gt 3^(@) gt RC-=CH`D. `3^(@) gt 2^(@) gt 1^(@) gt H_(2)O gt RC-=CH` |
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Answer» Correct Answer - C Alcohols are less acidic than water but more acidic than alkynes. Therefore, the correct order of acidic strength is `H_(2)O gt 1^(@) gt 2^(@) gt 3^(@)gt RC-=CH` |
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| 237. |
Lucas reagent is `,`A. anhydrous `ZnCl_(2)` and conc. HClB. anhydrous `ZnCl_(2)` and conc. `HNO_(3)`C. hydrous `ZnCl_(2)` and conc. `HNO_(3)`D. hydrous `ZnCl_(2)` and conc. HCl |
| Answer» Correct Answer - A | |
| 238. |
Separation of two layers are seen when Lucas reagent is treated withA. `CH_3OH`B. `CH_3Cl`C. `(CH_3)_3C-OH`D. `(CH_3)_3C-Cl` |
| Answer» Correct Answer - C | |
| 239. |
The order for the acidic strength of `1^(@),2^(@),3^(@)` alcohols, `H_(2)O and RC -= CH` isA. `R -= CH gt 3^(@) gt 2^(@) gt 1^(@) gt H_(2)O`B. `1^(@) gt 2^(@) gt 3^(@) gt H_(2)O gt RC -=CH`C. `H_(3)O gt 1^(@) gt 2^(@) gt 3^(@) gt RC -= CH`D. `3^(@) gt 2^(@) gt 1^(@) gt H_(2)O gt RC -= CH` |
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Answer» Correct Answer - C `H_(2)O gt 1^(@) gt 2^(@) gt 3^(@) gt RC -= CH` |
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| 240. |
Which of the following compound does not react with Lucas reagent ?A. `(CH_3)_3C-CHO`B. `(CH_3)_3C-OH`C. `(CH_3)_2CH-OH`D. `CH_3-OH` |
| Answer» Correct Answer - A | |
| 241. |
A mixture of methanol vapours and air is passed over heated copper. The products areA. carbon monoxide and hydrogenB. formaldehyde and `H_2` gas .C. formic acid and water vapourD. carbon monoxide and water vapour |
| Answer» Correct Answer - B | |
| 242. |
The compound X on treatment with acidified `K_(2)Cr_(2)O_(7)` gives compound Y which reacts with `I_(2)` and `Na_(2)CO_(3)` to form tri-iodomethane. The compound X is :A. `CH_(3)OH`B. `CH_(3)COCH_(3)`C. `CH_(3)CHO`D. `CH_(3)CHOHCH_(3)` |
| Answer» Correct Answer - D | |
| 243. |
Consider the following reaction, `A underset(H_(2)SO_(4))overset(K_(2)Cr_(2)O_(7))(rarr) "Acetone" overset("Oxidation")(rarr)"Acetic acid"` Identify A in the above reaction.A. 1-propanolB. 2-propanolC. 2-butanolD. Ethanol |
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Answer» Correct Answer - B The given reaction can be completed as `CH_(3)-underset(underset(underset("2-propanol")(OH))(|))(CH)-CH_(3)underset(H_(2)SO_(4))overset(K_(2)Cr_(2)O_(7))(rarr)CH_(3)-underset(underset(O)("||"))(C)-CH_(3) overset([O])(rarr)CH_(3)-COOH` |
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| 244. |
Phenol is less acidic thanA. ethanolB. o-nitrophenolC. o-mehtyphenolD. o-methoxyphenol. |
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Answer» Correct Answer - B Phenol is less acidic than o-nitrophenol as electron withdrawing `(-NO_2)` group increases the acidity of phenols while electron donating groups `-(CH_(3), -OCH_(3))` decrease the acidity of phenols , Phenols are more acidic than alcohols . |
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| 245. |
Phenol is less acidic thanA. ethanolB. o-nitrophenolC. o-methylphenolD. o-methoxyphenol |
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Answer» Correct Answer - B In o-nitrophenol, nitro group is present at rtho position. Presence of electron withdrawing group at ortho position increases the acidic strength. On the other hand, in o-methylphenol and in o-methoxyphenol, electron releasing group `(-CH_(3), OCH_(3))` are present. Presence of these groups at ortho or para positions of phenol decreases the acidic strength of phenols. So, phenol is less acidic than o-nitrophenol. |
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| 246. |
Which of the following reactions shows acidic nature of alcohol ?A. `ROH+HOOCR to RCOOR + H_2O`B. `2ROH + 2Na to 2RONa + H_2`C. `ROH + ClOCR to RCOOR + HCl`D. `ROH + HCl to RCl + H_2O` |
| Answer» Correct Answer - B | |
| 247. |
Use of methanol may causesA. blindness and death due to its oxidation to `CO_2`B. blindness and death due to HCOOHC. deficinency of calcium due to formation of saltD. disorder of blood hormones |
| Answer» Correct Answer - B | |
| 248. |
An ether is more volatile than alcohol having the same molecular formula. This is due to:A. dipolar character of ethersB. alcohols having resonance structuresC. intermolecular hydrogen bonding in ethersD. intermolecular hydrogen bonding in alcohols |
| Answer» Correct Answer - D | |
| 249. |
Phenol is less acidic thanA. ethanolB. methanolC. `o-`nitrophenolD. `p`-cresol. |
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Answer» Correct Answer - C Nitro is electron withdrawing group. |
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| 250. |
Boiling point of alcohol is more than that of ether of corresponding molecular weight , becauseA. alcohol being more soluble in waterB. ethers are non-polar solventC. hydrogen bonding exist between alcoholD. none of these |
| Answer» Correct Answer - C | |